Law
The Doctrine of Legitimate Expectation in Domestic Administrative Law
Quick fact
In many legal systems, a legitimate expectation arises not only from an express promise but also from an authority's long-standing practice, and courts have held that reneging without proper reasons can be an abuse of power.
Why this is interesting
You trust what the government tells you. But what if it suddenly changes its mind? Legitimate expectation is the legal safety net that catches you when that trust is broken.